I play on Window's XP, after about 1 - 2 hrs. of play time the horizons.exe starts thrashing my harddrive. I then begin to experience lag in the game and even the sound starts getting choppy. Anyone else experience this and if so any suggestions on how to fix it. Right now I logoff and wait for the horizons.exe to stop execution (which has taken up to 10 minutes before) and log in again.